Hello! I have been doing a lot of reading on Genghis Khan recently, and while many of his exploits and feats are well recorded and known, it seems that the last year or so of his life and time after for him are very foggy.

As far as causes of death go I have seen claims that he:

Died of wounds received in battle against the Xia in China.

Died of an arrow wound to his knee he received in battle in the Middle East.

Was killed when a vengeful concubine castrated him after having sex (apparently she was supposed to have been a surviving member of a people the Mongols committed genocide against or something).

He got some sort of sickness that killed him after several months.

etc...

What is the most academically believed account of his death?

Also, we know when he died his body was transported back to Mongolia, and the slaves who buried him were killed, and the soldiers who killed the slaves were also killed, meaning the secret of where he was buried was literally taken to the grave. To this day the tomb still has not been found and there are widely varying accounts of what region in Mongolia it might be, and what it might contain. Some say its just his sarcophagus, while others claim a huge cache of his treasure was buried with him.

What is the general consensus, if any on this?